/*
 * Copyright (C) 2011-2021 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */


#include "ByteOperands.h"

namespace intel { namespace sgx { namespace dcap {

uint16_t swapBytes(uint16_t val)
{
    return static_cast<uint16_t>( (val << 8) | (val >> 8) );
}

uint32_t swapBytes(uint32_t val)
{
    return (
            ((val << 24) & 0xff000000) |
            ((val <<  8) & 0x00ff0000) |
            ((val >>  8) & 0x0000ff00) |
            ((val >> 24) & 0x000000ff)
          );
}

uint16_t toUint16(uint8_t leftMostByte, uint8_t rightMostByte)
{
    uint32_t ret = 0;
    ret |= static_cast<uint32_t>(rightMostByte);
    ret |= (static_cast<uint32_t>(leftMostByte) << 8) & 0xff00;
    return static_cast<uint16_t>(ret);
}

uint32_t toUint32(uint16_t msBytes, uint16_t lsBytes)
{
    uint32_t ret = 0;
    
    ret |= static_cast<uint32_t>(lsBytes);
    ret |= (static_cast<uint32_t>(msBytes) << 16) & 0xffff0000;

    return ret;
}
uint32_t toUint32(uint8_t leftMostByte, uint8_t leftByte, uint8_t rightByte, uint8_t rightMostByte)
{
    return toUint32(toUint16(leftMostByte, leftByte), toUint16(rightByte, rightMostByte));
}

std::array<uint8_t,2> toArray(uint16_t val)
{
    return {{ static_cast<uint8_t>(val >> 8), static_cast<uint8_t>(val) }};
}
std::array<uint8_t,4> toArray(uint32_t val)
{
    return {{
        static_cast<uint8_t>((val >> 24) & 0x000000FF),
        static_cast<uint8_t>((val >> 16) & 0x000000FF),
        static_cast<uint8_t>((val >> 8) & 0x000000FF),
        static_cast<uint8_t>(val & 0x000000FF),
    }};
}

}}} // namespace intel { namespace sgx { namespace dcap {
